Simple Machines

Simple Machine A device that does work with only one movement Inclined plane, pulley, or lever

Levers Fulcrum-the pivot point Effort arm-the part of the lever on which the effort force is applied Resistance arm-the part of the lever that exerts the resistance force

MA of Levers length of effort arm divided by the length of the resistance arm

3 Classes of Levers First class-teeter totter Second class-door Third class-broom Third class always less than one Used to change the direction

Ideal Mechanical Advantage of a Lever IMA is the length of the input arm divided by the length of the output arm

Pulleys Pulley is a grooved wheel with a rope running along the groove Fixed pulley used to change direction of force and MA of 1 Movable pulleys one end is fixed and the pulley(s) are free to move Block & tackle- combination of pulleys

MA of pulleys Count the support rope Count the effort rope only if it pulls up

Wheel and Axle A simple machine consisting of two wheels of different sizes that rotate together Screw driver, ice cream freezer

MA of Wheel & Axle radius of wheel divided by radius of the axle

Inclined Plane A sloping surface used to raise objects

MA of Inclined Planes Length of slope divided by the height of slope

Screw & Wedge screw is an inclined plane wrapped around a post Wedge is an inclined plane with one or two sloping sides

Compound Machines Combinations of two or more simple machines Axe- wedge and lever

The End!!!